Brake and friction member



rIVI. CRAIGHEAD.

BRAKE AND FRICT'ION MEMBER.

APPLICATION FILED MAR.'24.1920.

@405,193 f y Patented Jan.31,19z2.

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MAGRUDER CRAIGHEAD, HARTSDALE, NEW YORK, ASSIGNOR T0 JOHNS-MANVILLE INCORPORATED, A. CORPORATION OF NEW YORK.

BRAKE AND rarcrron MEMBER. 'l

To all wfntom it mag/"concern:

Be it known that I, MAGRUDER CRAIGHEAD, a citizen' of the United States of: America, residing at Hartsdale, county of. Westchester, State of New York, have invented 'certain new and useful Improvements in Brakes and Friction Members, .of which the followin is a specification. A

y invention relates to brake bands and simi ar friction members in general but is 'particularly designed to afford a structure for automobile brakes in which the lining for lthe brake band can be conveniently removed and replaced without ,tak-ing off the wheel of the automobile or otherwise disassembling the brake elements. The best form of 'apparatus embodying my invention at present known to me is illustrated in the accompanying sheet of drawings in which- F ig. 1 is a side elevation of a brake band and lining therefor made in accordance with my invention; Y

F'g. 2 is a cross section on a large scale on line 2-2 of Figure 1, and

Fig. 3 is a similar cross section illustrating a modication. l`

Throughout the drawings like reference characters indicate like parts. 1, is the usual metal band or strip which surrounds the brake drum and has its ends drawn together to apply the friction, and pushed apart to release the friction. This strip is preferably forged or rolled, as shown with a Vseries of recesses 2, 2, formed in its inner face. These recesses extend across the band 'face' and are preferably ofsubstantially uniform cross section-throughout. The strip- 1 should have at least one edge free from any overhL ging ledge or other projection radial to t ve arc to which the strip is bent so that any desired facing member can be inserted beitween the strip 'and the brake 'drumV when the brakes are in released position -by simply slipping such facing strip in under the strip 1 from one side thereof, the movement of the so inserted element being parallel to the axis of the brake drum. 3, 3, are sections olf lining for the brake band usually composed of some friction producing material such as an asbestos mass or `composition and these sections each have a face on one side curved to an arc of a circle having the same cen er as the brake drum and are provided on the other face with projections 4, 4 extending radially of the said arc and J ASpecification of Letters Patent. Pafgnd JaKL 31a ggg. application meansrcn 24, 192e.' serial no. 368,254.

can be easily slid'in or out of position sideways for replacement purposes. To hold the" lining in position relative to the band when the brake is not being applied, some light fastening means is employed such as wires or strips 5, 5, passing throughA transverse perforations in the liner sections, or molded or otherwise incorporated in place in the process of making the liner sections. These wires are twisted up around the outside of the brake band and may be tied or twisted together in a knot or twist 7, as shown in Fig. or may be simply hooked over the edgesof the brake band as shown in Fig. 3, at 6. In use, whenever the brakes need relining `the fastening wires 5, 5, are straightened out, or unfastened, the liner sectiqns 3, 3, slid out sideways and fresh sections slid back into position and fastened to the brake band by the wires .or strips as before. Thishav'oids taking ofi' the wheel of the motor car or otherwise disturbing the remaining elements of the brake constructlon.

Of course,vv` the brake band and brake drum I It is understood that each lining block I may be ma'de with a plurality of the projections 4, 4, and corresponding fastening wires or strips, 5, 5.

It is preferred ton have the fastenin Wires run through the projections 4c, 4, as t is enab-les the lining blocks to be worn down without cutting through the fastening wires, but as far as fastening is concerned, it is not necessary that the wires run throughV the projections, butmay be at any part of the blocks. Having described my invention, I claim:

l. In a friction device the combination of a backing member having an inner, generally cylindrical face with one edge freev from radial projections, but having a transverse recess of uniformcross section, a lining body prises a Wire passing through a transv'ese fitting said inner face and having an inteperforation in the projection on the lining gral'. projection engaging said recess, and body, and having its ends passing around 10 means for fastening the backing and lining the edges-'of the backing member. 5 together. 'MAGRUDER CRAIGHEAD.

2. A combination such as' set forth 'in Witness: claim l, in which the fastening means com- B. C. MCCLURE. 

